Untitled

package mongodb;

import java.util.*;
import org.bson.*;
import com.mongodb.client.*;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Updates;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;

public class mongomau{
	public static MongoClient mongo;
	public static MongoCredential credential;
	public static MongoDatabase db;
	public static MongoCollection<Document> collection;
	public static FindIterable<Document> ft;
	public static Iterator<Document> it;
	public static List<Document> list;
	
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		mongo = new MongoClient("localhost", 27017);
		credential = MongoCredential.createCredential("root", "root", "password".toCharArray());
		System.out.println("Connected to the database successfully"); 
		
		db = mongo.getDatabase("myDb");
		System.out.println("Connected to db successfully");
		
		collection = db.getCollection("ipl");
		
		while (true) {
			System.out.println("1. View\n2.Insert\n3.Update\n4.Delete\n\nEnter your option: ");
			int ch = Integer.parseInt(sc.nextLine());
			switch(ch) {
			case 1:
				retrieve(collection);
				break;
			case 2:
				insert(collection, sc);
				retrieve(collection);
				break;
			case 3:
				update(collection, sc);
				retrieve(collection);
				break;
			case 4:
				delete(collection, sc);
				retrieve(collection);
				break;
			default:
				System.out.println("Invalid choice:");
			}
		}
		
	}
	
	public static void retrieve(MongoCollection<Document> colleciton) {
		ft = collection.find();
		it = ft.iterator();
		while(it.hasNext()) {
			System.out.println(it.next());
		}
	}
	
	public static void insert(MongoCollection<Document> collection, Scanner sc) {
		System.out.println("Enter team name: ");
		String tname = sc.nextLine();
		System.out.println("Enter title won: ");
		String twon  = sc.nextLine();
		System.out.println("Enter captain name: ");
		String captain = sc.nextLine();
		Document d = new Document("TeamName", tname).append("TitleWon", twon).append("Captain", captain);
		collection.insertOne(d);
	}
	
	public static void update(MongoCollection<Document> collection, Scanner sc) {
		System.out.println("Enter team name: ");
		String tname = sc.nextLine();
		System.out.println("Enter new number of : ");
		String ntwon = sc.nextLine();
		collection.updateOne(Filters.eq("TeamName", tname), Updates.set("TitlesWon", ntwon));
	}
	
	public static void delete(MongoCollection<Document> collection, Scanner sc) {
		System.out.println("Enter team name: ");
		String tname = sc.nextLine();
		collection.deleteOne(Filters.eq("TeamName", tname));
	}
}